ie no activity whatsoever (ie not just no new images, but not even an update to say they're still around)
I created a "missing" group which I just put two in that haven't shown up since 2019 and 2017 respectively Zimbono and Amonzone:
There are probably others but off hand I'm not sure which.
Figuring we could add them and if they return, remove them from the group.
Easy way to keep track of missing persons, show concern for our beloved dream-creators and dream-manifesters.
edit: scratch that, Amonzone is still adding stuff to pixiv it seems, just hadn't had anything new on Paheal since 2017 so I had assumed the worst